/*---------------------------------------------------------------------------*
  Project:  NitroSDK - GX - demos - UnitTours/2D_CharBg_2
  File:     main.c

  Copyright 2003,2004 Nintendo.  All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law.  They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Log: main.c,v $
  Revision 1.29  2004/11/02 09:34:15  takano_makoto
  fix comment.

  Revision 1.28  2004/05/24 10:29:01  takano_makoto
  fixed autotest code

  Revision 1.27  2004/04/07 01:23:27  yada
  fixed header comment

  Revision 1.26  2004/04/06 12:48:06  yada
  fixed header comment

  Revision 1.25  2004/02/24 05:25:21  yasu
  used OS_EnableIrqMask instead of OS_SetIrqMask

  Revision 1.24  2004/02/18 01:09:52  yasu
  added comment for code32.h

  Revision 1.23  2004/02/12 07:06:26  nishida_kenji
  changed to avoid generating STRB in THUMB mode.

  Revision 1.21  2004/02/09 01:44:47  kitani_toshikazu
  added default setting codes for auto testing.

  Revision 1.20  2004/02/05 07:09:02  yasu
  changed SDK prefix iris -> nitro

  Revision 1.19  2004/02/05 01:15:24  kitani_toshikazu
  added codes for autoTesing.

  Revision 1.18  2004/01/19 02:15:56  nishida_kenji
  fixed comments

  Revision 1.17  2004/01/18 09:20:26  nishida_kenji
  added DEMOStartDisplay

  Revision 1.16  2004/01/18 07:12:43  nishida_kenji
  changed the place of SVC_WaitVBlankIntr

  Revision 1.15  2004/01/09 12:02:34  nishida_kenji
  used OS_SetIrqCheckFlag at VBlankIntr()

  Revision 1.14  2004/01/07 09:38:05  nishida_kenji
  revised comments

  Revision 1.13  2003/12/25 11:00:09  nishida_kenji
  converted by GX_APIChangeFrom031212-2.pl

  Revision 1.12  2003/12/17 11:35:17  nishida_kenji
  used DC_FlushRange

  Revision 1.11  2003/12/17 09:00:20  nishida_kenji
  Totally revised APIs.
  build/buildtools/GX_APIChangeFrom031212.pl would help you change your program to some extent.
  $NoKeywords: $
 *---------------------------------------------------------------------------*/

//---------------------------------------------------------------------------
// A sample that use BG #2 as affine mode(rotate):
//
// USAGE:
//   UP, DOWN, LEFT, RIGHT: Change the center position of rotation
//   L,R:                   Rotate BG #2
//
// HOWTO:
// 1. Set up the character/palette/screen data same as 2D_CharBG_1.
// 2. Set up a matrix and points by G2_SetBGxAffine().
//---------------------------------------------------------------------------

#include <nitro/code32.h>   // avoid byte access problems
#include <nitro.h>
#include "DEMO.h"
#include "data.h"

static u8 sScrnBuf[SCREEN_SIZE];                           // Buffer for screen data(BG #2)

void NitroMain(void)
{
    s16 x_0 = 0, y_0 = 0;
    s16 x_1 = 0, y_1 = 0;

    u16 rotate = 0;

    //---------------------------------------------------------------------------
    // Initialize:
    // They enable IRQ interrupts, initialize VRAM, and set BG #2 for affine mode.
    //---------------------------------------------------------------------------
    DEMOInitCommon();
    DEMOInitVRAM();
    DEMOInitDisplayBG2Only();

    //---------------------------------------------------------------------------
    // Transmitting the character data and the palette data
    //---------------------------------------------------------------------------
    GX_LoadBG2Char(d_64_256_bg_schDT, 0, sizeof(d_64_256_bg_schDT));
    GX_LoadBGPltt(d_64_256_bg_sclDT, 0, sizeof(d_64_256_bg_sclDT));

    {
        int i, j;
        for (i = 0; i < 8; i++)
        {
            for (j = 0; j < 8; j++)
            {
                sScrnBuf[(i * 16) + j] = (u8) ((i * 0x10) + j);
            }
        }
    }
    // Store the data in the main memory, and invalidate the cache.
    DC_FlushRange(sScrnBuf, sizeof(sScrnBuf));

    // DMA Transfer to BG #2 screen
    GX_LoadBG2Scr(sScrnBuf, 0, sizeof(sScrnBuf));

    DEMOStartDisplay();
    //---------------------------------------------------------------------------
    // Main Loop
    //---------------------------------------------------------------------------
    while (1)
    {
        MtxFx22 mtx;
        fx16 sinVal, cosVal;

        DEMOReadKey();

        if (DEMO_IS_PRESS(PAD_KEY_UP))
            y_0 -= 2;
        if (DEMO_IS_PRESS(PAD_KEY_DOWN))
            y_0 += 2;
        if (DEMO_IS_PRESS(PAD_KEY_RIGHT))
            x_0 += 2;
        if (DEMO_IS_PRESS(PAD_KEY_LEFT))
            x_0 -= 2;
        if (DEMO_IS_PRESS(PAD_BUTTON_L))
            rotate -= 256;
        if (DEMO_IS_PRESS(PAD_BUTTON_R))
            rotate += 256;
        if (DEMO_IS_TRIG(PAD_BUTTON_SELECT))
        {
            x_0 = 32;
            y_0 = 32;
            rotate = 0;
        }

        sinVal = FX_SinIdx(rotate);
        cosVal = FX_CosIdx(rotate);

        mtx._00 = (fx32) cosVal;
        mtx._01 = (fx32) sinVal;
        mtx._10 = -(fx32) sinVal;
        mtx._11 = (fx32) cosVal;
                
        #ifdef SDK_AUTOTEST
        x_0 = 10; y_0 = 15;rotate = 4096;// default params for testing.
        GX_SetBankForLCDC( GX_VRAM_LCDC_C );
        EXT_TestSetVRAMForScreenShot( GX_VRAM_LCDC_C );
        EXT_TestScreenShot( 100, 0xD4F05FD3 );
        EXT_TestTickCounter();
        #endif //SDK_AUTOTEST
        
        SVC_WaitVBlankIntr();                              // Waiting for the end of V-Blank interrupt

        //---------------------------------------------------------------------------
        // Set up affine transformation of BG #2
        //---------------------------------------------------------------------------
        G2_SetBG2Affine(&mtx,                              // a matrix for rotation and scaling
                        x_0, y_0,                          // the center of rotation
                        x_1, y_1                           // the reference point before rotation and scaling applied
                        );
    }
}

//---------------------------------------------------------------------------
// V-Blank interrupt function:
//
// Interrupt handlers are registered on the interrupt table by OS_SetIRQFunction.
// OS_EnableIrqMask selects IRQ interrupts to enable, and
// OS_EnableIrq enables IRQ interrupts.
// Notice that you have to call 'OS_SetIrqCheckFlag' to check a V-Blank interrupt.
//---------------------------------------------------------------------------
void VBlankIntr(void)
{
    OS_SetIrqCheckFlag( OS_IE_V_BLANK );                   // checking V-Blank interrupt
}
